The war brought on another important change for the people of Rogaška Slatina, and even more so for the inhabitants of the surrounding area in the east and southeast. After Slovene territory was carved up among the occupiers, the border between the German Third Reich and the Independent State of Croatia ran through it. The Germans and Croatians resolved their border issues regarding the exact course of the boundary by late June and the Sotla River became a boundary river. For the majority of Croatians from the Hrvatsko Zagorje region on the other side of the border, who used to migrate to the Slovene side on a daily basis to go to work, shop, see a doctor, go to church, etc., crossing the border suddenly became very difficult. The border was soon heavily guarded by the Germans; they protected it with minefields, barbed wire barriers, watchtowers, stations with machine guns, etc. In the borderland, they tore down all the buildings and thinned the forest to roughly 50 metres wide, enabling greater control of both sides of the border. This was mostly carried out with forced labour, which involved the local population. The owner was allowed to remove the felled wood and use it for his own needs; if not, it was removed by forced labourers for the needs of the Germans. They were not allowed to pile branches but had to scatter them as widely as possible across the clearing to prevent undergrowth.
The border was regularly patrolled. A watchtower often stood next to the border, built with four load-bearing posts made from pairs of logs; at the top there was a covered guard station, measuring roughly 3x3 metres. The guard station could be accessed by a ladder or wooden stairs. Next to the tower they often built bunkers and installed telephone lines. The Germans already began to fortify the border in the vicinity of Rogaška Slatina with safeguards in the autumn of 1941.
Fatalities on the Border
Along the border – the Sotla River – the Germans erected a two-metre-high chainlink fence, which was topped with three rows of barbed wire. Behind it they placed a two- to three-metre-wide strip of barbed tape, followed by landmines a few metres apart. The landmines were placed by the army while the rest of the work was done by conscripts. Three types of mines were used: 1) the so-called sifonarice, which were primarily meant to scare; they were placed ten metres from the wire; 2) black mines, with a serrated edge and much more dangerous, were placed right next to the border; 3) the most dangerous landmines were activated by the pressure of around 30kg.
Mines were the greatest threat to the local population. They hindered or even prevented the people from crossing over to the fields and forests, and it took them much longer to get to the shop, doctor or church. Livestock could no longer graze in the borderland because landmines were often detonated and animals died when they reached beyond the wire. Animals were not the only landmine casualties – so were people.